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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc03152a516f4c1161971a3ee03cfad3c6132d202a3098bc08c0e9efa276c0e' 
  AND token = 'FURnlOTuVOsx9og/oqP5ptk2u5/NUBtL66KQWRF+p+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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