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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02e4f6f96ccce9f8721c263f7366e0956cf937db946f6291961f1915d5c245c' 
  AND token = 'zOoHF2Shxcj0eQ9eGIGmXr6kuVbxKQRfoatguSFMJFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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