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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b77f51c6a03eba107b81c331e730c66099aaea9d79689dfc40ba9a658ee6863' 
  AND token = 'algaUD4xNg6tivDzJCiO9gV/6e0LnmZgCgcJYNgU5+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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