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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0a055c73e81936073dc0e6f0c1a8b4dbd27bd9f2b8191dbf17bb6e1e5da17f' 
  AND token = 'QjoCEAursPkE677mmR553iH/7lgWNH0Szy/cmyNKpvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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