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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f271f32737cd279bda0c3ba0c5ef11f9b503e73b4f7631a54942941ed6b9f56e' 
  AND token = 'J+DkqfGDOWr602AQXuh3JLUlJYAog5sfYv1v1y4lMZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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