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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d2c789e409cd104532a1f0c84034a9f2be12ecdc1ccee3995a764faa6c7fca' 
  AND token = '3jVt201eSwtxJvRnOztGLa0pxxbrwSCCD+RZIRDLY1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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