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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824b87546de044719839dfd36fb439ef5171c8a563b0e3c26c9c0cd78af142c3' 
  AND token = '4jr8iM1FvaAvKr/DRibja44Wcxg0EEMkFVrHSEMvexM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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