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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a625c14cfffca0d2f1b928bc71a0224b1e23200039a1d975a06023d08a7de2a9' 
  AND token = '95J4JHDwtZNrxptkfEB2voQTtRtkkqhxFbB3JEUIc3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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