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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b96e2bf3fd1d66efea8c7904969eee2f0068af09466a90ab148b5bb63a919ca' 
  AND token = 'J7IPVHajq3sso0WJqHKotgKNxiJd9y1fqovnoHAsxEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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