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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe62fef2573f27821082a1e7a81c7e6d3d75132ac9add0c7427e252aa1f64d6' 
  AND token = 'TgJmb5k0K7hCGppTg+j0qjsocmecnWi33Epc+vpkjLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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