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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1cace26413a3df4488f56e304c517da104bfaf373a4e9d0ad17f282e27832c' 
  AND token = 'V+9tZQVEHXejk+c9RygXoJ+No2fG7iC9p20ZYf4mQjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00130

JSON explain

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