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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9eaf0ceac7cec7778be897697658b5048d7a63d7c989d03a2a674a98f0511b' 
  AND token = 'QlAqo84/lMup1uygvjCZtTrjQqpXdotMx+7teaKy8fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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