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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83daa75541bf8453219cb9d04b30a092a4d4e4f2de6021debbcbbea1a15b678' 
  AND token = '1t799msPPkl69Pmr2M98jcJT3/iDfGySEk3KlFN2EUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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