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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96923e86443fdeefc85632688350dfb29e3c4684d3ac0f53935cae9ca8b9151a' 
  AND token = '2PR8gi6IPIsk7O0rBpnjaVzdOhnn/YNfNUT4aicuGgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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