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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d771d3b8850cb2e27db582a71f86625db9952e79e21946e40208e8ada77d23a' 
  AND token = 'PDo96DNoICkaYbNl8Bo7a4dn6Ahs9IAAk7/Y5XK3XeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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