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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896f2d7f7c1faf2a0c8ef1828bdc5a149d510619a7f96312479bc346d24fa329' 
  AND token = 'UyTAN5SwKc6bmNvujgDdzrPfTIUxGULlJf8Sf8ix/3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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