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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e06c9f7d325e5b30aab303ae63330c0789cc250dd452e48c6465dacf028d28f' 
  AND token = 'OEbahF5hDBy8HcYQ/EOLzk//4NWmTNJmDl29k7c0BW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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