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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe5d5454d2615cd079593dbc74c9575a087eb737666f2cb063bbccf1ec9a53c' 
  AND token = '9AcMmB+/cPTC6bLFq6RMiGOjk4gimrvnW1S5Cr+Oq2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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