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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb1e01afa85e6ec913680cefd71a41c89149e465aba57db9cae8e37e03dde87' 
  AND token = 'y3QVdY4bSrS39pQFfF91TZh8RQ9fEHLzLJW9Llor5IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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