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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cc39e4e9c97e0885a3651b2c0999326e499eeda34083e83cb24098d20d8f8b' 
  AND token = 'mHM6Xd5Hr/dlL9/9cJNXSTMT+LHc2DCzvro/NknZeQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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