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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77492b2b4185b94cb4ead8eb46e6cbfa0e0b985a885f03ff8108580ab01f42f' 
  AND token = 'Qa0WFMkhhk0KQaUDNLYNnl7VwB8aJC2fDQKZniugY64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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