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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdc8c72ee508a5635a00811195b95b1ffe2529b1c678f4ef58c289c470a114b' 
  AND token = 'BhWG9Iz67g5gdsKPObcnWrNkeFb02TC37YpqdUi0Yzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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