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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409d08fe37c6a26f5d0bcf8f353707955b39ca7a678dd22b83f2efc9bb253374' 
  AND token = 'OPfrrCOS3F2nsAuQLV6FWeSxDWb2PQiJdiTHSvHa2Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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