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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f2c72968de7955b74648b7bcedf347799e2cc6c0054ae0bd41265d6efd37e8' 
  AND token = 'Mo3+8TziqPiJfAtadObhIjSFbpZeTqO5JcBXVBq42UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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