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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc0d9b34ab2a660a382e5afa98914f811182995ec7c2f28c09af41ec00437f0' 
  AND token = '7xhi4VIxhlDDZPrR+eBqBxo85dm4UGd7JdPlTUmZxFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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