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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f03dea41f237b6589a52fe375bdae592894ece8ffc762169deb68333ceb4e4' 
  AND token = 'OZhAkq6Uh5ROz0fc3Wjs0S/9uFGz98m5bQ8F+NdE+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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