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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71b7959dd9ab0e3e2db88dd9c06ea36bbc9da1a5cecdbc11a739ec75e173fe7' 
  AND token = 'azLwP1zdKDmurj3sfV/IYYaI7jUmiVTuA8LiDQpH9IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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