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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38921d729c453a58b87f0d74d06d134b49ac3859e4599bcf9cfa96f30568fdf7' 
  AND token = 'q8ty9QCojn8X8PvA1k8VdVXR+fUEwl17LznRTzGNki4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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