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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6aa5199e7dc647131aa52f4f595b0bbe47ae50475c6e3e23fc1a335968e60e' 
  AND token = 'o8fQiL88DL9S1lPwdKnQ46GDKtwwC8xSNkPqq2okSl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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