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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666c2134653c5ddc8a8ef3f05fac93b93e98baafa1c51b3f2682221b834c6a85' 
  AND token = 'QMWdp60PI6zGVNRDCbG0+kk5sHODspopuoVeEVPWJNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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