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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63c7ca007214834a248b5df00245e75a370da6c81b06f9ca9ef22fa58e8cf38' 
  AND token = '2LiE1/mZRSanxNkIVxPFflWxbWwGwTIq0V8RkKi5DkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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