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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309d4f4d197d042d2dfb15cf12eeb3f18e78fc50cc98d6d8bac787fef359d89b' 
  AND token = 'UDaKLY9fKDoue/QMIQB23KqehzpM7trQ+96bmkpX+m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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