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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f674cf4c3fc9cb7410148475970ace7811c042ee9bf6d093c259c3eba8c4fc92' 
  AND token = 'PbZHXfvEDgjbCg5pOC5WeYl6mve/qkLIk8Q1tvhRD78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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