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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3adb523ccec47d3e372794002ab4c8aece6f6a693abdc5a762388ed8654ef4' 
  AND token = 'WqvIAmgRu50v7QW8wLAI2N3FfjtSXg9JTKMsBQ+ktAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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