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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a86d6dd37286c54e525b11af54a130f8130755244be2d69f1c2d21f9d5e7b25' 
  AND token = 'Dn5KUIQvw6BSPaCaXJid/aSrF3wjc35hNu+XQHCLc7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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