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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77f3af00049a9cb7b963c3e8d7d10b4976772b2fcd877574d87c927065b686d' 
  AND token = 'yddOkclI3nmgvc7XnRIwE0bHtB2JKxmIyNHVhwKObwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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