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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7b79d02a257eac93bad673c9f6b8e214acbfbd1e87c0dd0d9834061318ad12' 
  AND token = 'JhSCjHXxuBndKanqge46tI1QuEjrylZoaTzuaSGgGEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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