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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcffcd1a77f9775e7b7299b79f9aa0c8c0b2e6cc0b954ff1d915683167dcc65' 
  AND token = 'bl5MMnUu+klCiCcwZanHuQgo23EUCc5QVfAs17r5LWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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