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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fccdef1ae195d2f961929169c0e24ebd268cf9375f4a20f26bf16c66f73ca5e' 
  AND token = 'JwEDbDMqtsF7BBHekxuvpTqD2Np21d2B2WBakpR03zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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