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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f64c0bbd4bd1f4139af324ba1ac605fab1f1def7521925ecc4aac99217297e' 
  AND token = 'hUQ8udKbPnrZ0DYVv5EYs4LSERd51S6HfO33SMclFGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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