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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d34a89ea6b837295689f055c76d9b461f21cbc137610a5eff92422b9e9b3ffa' 
  AND token = 'TQBeuN9ig8ROV8hrDVV8CsS04NFkOTBOhDF2AUoCQfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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