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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9167f38ed12004e8225f7a42006c8524e756274d838c85a5962f2c9aef8875bc' 
  AND token = 'c6+gJl8DMC1l0AOuHKp1zFrRgzsE2jiFy7uVLi9ICFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}