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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ec16e68a3ae903b7a6e729b569d49e846a9c8a21d5a2fee1db7e98efe75dac' 
  AND token = 'w1mRYTZr4Ew5gtDw1/gblriEHOiYAdl+DVEy3U89JRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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