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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89449a1657c780893d36656052f269d55cf4b98446af745585c063030dfd8053' 
  AND token = 'LXzUmHVuaJUSPdKlAWFj3YFJT3RPKmUPzzbKb7z7PQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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