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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5618aef85e3eaefe57858fd18046ed2b684411ab0fd02516a2b1d529ef1dbaee' 
  AND token = 'sj8Jywnujt8TlNZrJzDcd2fH4ysqNmis18K7NdSMFU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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