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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770d595608fdb15061260bfae431a9a268dfb49e76a15323ac0503b36762078f' 
  AND token = 'j5MwPwSUJMc00fg6hlWG5baT6+JJ2scWYFEXJbhQfwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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