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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc04364131d558d0885ba3469a2893e0bb6b0564e1103588d312881d91d4d8e' 
  AND token = 'KOeDpPCotT99zCgrG7B5XXBQXNMFw6uWFvDRzFlyMOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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