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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8790eee916e75f3dd700c3c48337ab831f610c9cd2131e646d97095f53d9f06e' 
  AND token = 'Nq4w6sdC9dDDcYUlwcRniihkkpwuOQ8IKOhS/5VerJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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