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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e38f1733971c4679e8d3df1eef49a8d6733bfe76388b2f7140cbb1d57036b2a' 
  AND token = 'H5144586UN9Smy7OVvJtX/vSiZWvBT7xbIsX/Nbl9F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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