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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14aa58b31fb3582054d0338b5afbc4b2a06e2aaa0b5433976e74edb63f44b578' 
  AND token = 'PvBcUd+ecFJ00fK7JJ5duHhko8UaFjAzHZLotP53LGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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