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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64860d4cd037419d7b046696b505baf50bc7448778e1125d42a52bef8401ad84' 
  AND token = '96E7InqCovpKkx+gLFeo9fsaOeSU19Hskc2074GCvn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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