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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf149af2146668ed8f143d136dfb39b02867ed0f058dbc96992b489f8bb4c0d7' 
  AND token = 'cs14gFBlp4TcAn/228MbG9E3Ty3kxXHCwVqQLpLIxBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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