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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ca39c59eb9f348b7250e4c1385aaa04c0f783b5c18e64d0ae6a12955890888' 
  AND token = 'K4pwx2H/uD5DgqjvOHnbDIAZG8WSi4SoZtbQLbe2GLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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