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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '486cf52bb3aaabd1e468eda67c86b06c0b5efc5150e415dc0ebf6e0c6e3b1e4d' 
  AND token = '+cmVIlEcYKLeF9lfiJcCExnoBKaJ8/JQUY4Nk3VTwME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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