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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de86e5f911550a5aa9b1cb1d3f72ff7aec14d2fd8810b9692794c5be2322b59' 
  AND token = '84w9cKYPrzTw4YzvnYWfIxOHeElezrXS2eXCQvbAu0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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