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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b82df8eff468c9158150a01df42e9f1e55d92b5381ba5e57afbd71cd1d6f56' 
  AND token = 'yoRLjsL5syDjYQj14MyGGuXe4p0pXOa+t5pdGXaI4d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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