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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d7ebf751216d11b03471f084ad840f5fc5de2370a2a4790edd12f3797329d6' 
  AND token = 'TqiKMkfhm0ycMpfKJhCAj9d2vbJ1wx4tYSL/ddQw/fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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