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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea927aec5e3d7a50664f2e987d542e9e1ddeabefbe3dd6399781d84fe2d3c2eb' 
  AND token = 'rVBAF+ZjvTittCfHE5lCBDmL8x9mxC/o7TrOSxqVzFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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