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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83649069876f82e48a7635885e6d2155e83f8c0a607e87be8c0318dd96e071f9' 
  AND token = 'efr3mFQjpCQNrJalvOpBCub81KU1TNFrVnW4VYZi360=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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