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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b79b8ac29eb68e5df9a5eee79567a31c041982755d47bea33446ddbd370c81' 
  AND token = 'i7lsR9evlLT3GQKkPdson6hDdTma3lFie647DrkAjx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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