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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7135e9892558ca98312ef62dbb5654b9732c42f0f3ce8ac8487383dd8fa1e75a' 
  AND token = '/nMrcoPN0h748GRK0XEEUXVvLfZwHLaMNUlvrZM7PlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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