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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b0827774a7a815462ba85dcd4fca7cdb97b4d1817f4f06e913a377fbdd88b5' 
  AND token = '/LQzvprfolKbrCTL7DBJBmhCe4+pmT7P6nTh1mk6gTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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